While the work of leaders is undergoing radical redefinition, the importance of leadership is greater than it's ever been. Walk into any fast company, and you'll feel the influence of its leaders.

Walk into any fast company, and you'll also sense that there are leaders at all levels, in all functions, and in all parts of the organization. These days, the creation of a vibrant network of grassroots leaders may be the most important - as well as the most difficult - aspect of developing the art of leadership.

You've read about change agents, thought leaders, models, and mentors in the magazine - now meet them one on one at Fast Company RealTime.